Offers FULL boolean searching. Now (unfortunately)
owned by Lycos.
Very large! Uses the Open Directory, Inktomi indexing services, but
ranks results using "Direct Hit" algos data and it's own internal data.
Its 'popularity' result engine is a mixed bless ("clicking" algo: the more people click on your
site the more it weights). Moreover it seems to give a lot of weight to older pages.
Note the "Search within these results" option!Try the VERY POWERFUL advanced options:
[Hotbot advanced search form]Powerful filtering capacities: http://www.hotbot.com/prefs_filters.asp
Powerful result-parsing capacities: http://www.hotbot.com/prefs_results.asp"Customize hotbotIndexing service:
Inktomi
Spider: Slurp.
Apart from Hotbot, Aol, Snap and MSN, Inktomi serves also private databases with its spider.

Nemo's preferences for Hotbot:
Although HotBot's paid results on SERPs, HotBot has a rich
(and sometimes unique:) filters which let you get ride of most
commercial crap.
Some pages we are trying to find have a hard edge: they
must have to have a box where you can put your search
query. In HTML language this means that the page must have
a form and HotBot is the only search engine that lets you
search for pages containing forms. The syntax is feature:form.
HotBot has other powerful advanced filters which let you
pinpoint precisely what you want, among them: domain search,
region search, language search, words to include and words to
exclude.
I'll show you some exemples of how to use it. Lets search for
resources on portuguese laws. In order to do that you can use the
following queries on HotBot:

Any of the Words, Anywhere in the
Page: lei leis ("law" & "laws" in portuguese)

None of the
Words, Anywhere in the Page: murphy Kirchhoff (some false
positives)

In your case change the fields Language:,
Domain:, Region: and Any of the Words, Anywhere
in the Page: to the ones that better describe your needs.

Infortunatly HotBot let's you use 'Any of the Words, Anywhere
in the Page' only once, that why I have to search for 'search',
'procurar', 'procure', 'pesquisar' and 'pesquisa' (these words
are semantic sinonyms of 'search' in portuguese) in separated
queries.